CN-122021279-A - Ship global deformation and optimization method, program, equipment and storage medium considering drainage volume precise control and deformation rationality

CN122021279ACN 122021279 ACN122021279 ACN 122021279ACN-122021279-A

Abstract

The invention belongs to the technical field of intelligent digital optimal design of ships, and particularly relates to a ship global deformation and optimization method, program, equipment and storage medium considering accurate control of drainage volume and reasonability of deformation. According to the invention, the analytical expression of the drainage volume change quantity relative to the global deformation parameter is obtained based on the numerical integration and the recursive formula, the reasonable deformation parameter range of the ship body is determined based on the global deformation modification function and the rule design space, the ship body is not required to be actually deformed, the corresponding volume change quantity can be directly predicted according to the design parameter, and the accurate feedforward control of the volume constraint and the reasonable direct judgment of the deformed ship are realized. On the basis, the agent model is combined to realize the rapid optimization of any ship-shaped structure under the constraint of reasonable deformation and precise volume control. The invention converts the traditional experience iterative process of design-verification-adjustment into deterministic one-step calculation, and the subsequent optimization can be directly carried out in a reasonable design space verified in advance.

Inventors

LIU XINWANG
WANG LUYAO
AN YUQUAN
Rong Zitong
YUAN LEI
JI XIAOHANG
SUN XU
MA MINGSHAN
Duan Jindi

Assignees

哈尔滨工程大学

Dates

Publication Date: 20260512
Application Date: 20260120

Claims (10)

1. A ship global deformation and optimization method considering drainage volume precise control and deformation rationality is characterized in that: Determining an original ship shape and a drainage volume control interval, and taking the initial position of a deformation area, the final position of the deformation area, the position of a fixed cross section in the deformation area and the amplitude of a global deformation modification function as optimization targets along the ship length direction of the original ship shape; Acquiring samples in the rule design space, wherein each sample is a group of optimizing target parameters, and an initial sample set is obtained; Constructing a deformation rationality constraint condition, and taking an intersection of a rule design space and the deformation rationality constraint condition as an optimizing design space; The method comprises the steps of performing screening on an initial sample set, removing samples which do not meet deformation rationality constraint conditions, obtaining real performance indexes of the ship after global deformation corresponding to each sample for the rest samples, constructing a proxy model, and outputting performance index estimation of the ship after global deformation corresponding to the sample according to the input samples by the proxy model; Setting a station number and a station abscissa, performing transverse section cutting on the original ship at each station abscissa along the ship length direction, calculating the area of each transverse section, and constructing a two-dimensional point set of the station abscissa and the area of the corresponding transverse section; performing Lagrange interpolation on the two-dimensional point set to obtain polynomial expression of an area curve of an original ship profile cross section, constructing a volume change amount expression of the ship profile after global deformation corresponding to the sample based on parameters in the polynomial, and further constructing a volume change amount constraint condition of the ship profile after global deformation according to a drainage volume control interval; In the optimizing design space, taking the agent model as an objective function, executing optimizing based on the volume change constraint condition of the ship after global deformation, acquiring a group of optimizing target parameters which meet the volume change constraint condition of the ship after global deformation and correspond to the optimal performance index, and executing global deformation of the original ship according to the group of optimizing target parameters.
2. The method for global deformation and optimization of a ship taking into consideration drain volume precise control and deformation rationality as set forth in claim 1, wherein the global deformation modification function The method comprises the following steps: Wherein, the And (3) with A starting position and a terminating position of a deformation area along the ship length direction of the original ship shape; Modifying the amplitude of the function for global deformation; the position of the cross section is fixed in the deformation area.
3. The method for global deformation and optimization of a vessel with consideration of drain volume precise control and deformation rationality as set forth in claim 2, wherein the deformation rationality constraint condition is that The method comprises the following steps: 。
4. The method for global deformation and optimization of a ship taking precise control and deformation rationality of a drainage volume into consideration as set forth in claim 3, wherein the determining of the upper and lower limits of values of the parameters creates a rule design space ; In a regular design space Middle collection sample Each sample is For a set of optimized target parameters, Obtaining an initial sample set; the rule taking design space And deformation rationality constraint Is taken as the optimizing design space ; The initial sample set is screened, samples which do not meet the deformation rationality constraint condition are removed, and the rest samples are subjected to the analysis Obtaining the real performance index of each sample corresponding to the ship shape after global deformation Constructing a proxy model Proxy model Can output the performance index estimation of the ship shape after the global deformation corresponding to the sample according to the input sample I.e. 。
5. The method for global deformation and optimization of a vessel with consideration of drain volume precise control and deformation rationality as set forth in claim 4, wherein the set number of stations is And the horizontal coordinate of the station , For the original ship type, the horizontal coordinate of each station is along the ship length direction Performing transverse section cutting to calculate the area of each transverse section The method specifically comprises the following steps: Acquiring the abscissa of the station Discrete grid points on corresponding cross sections , Using the Green formula to calculate the cross-sectional area ; Wherein, the , ; Building a station abscissa Area of cross section corresponding to it Two-dimensional point set of (2) 。
6. The method for global deformation and optimization of a vessel with consideration of drain volume precise control and deformation rationality as set forth in claim 5, wherein the pair of two-dimensional point sets Performing Lagrange interpolation to obtain polynomial expression of area curve of original ship-shaped cross section ; Based on parameters in the polynomial Constructing a volume variation expression of the ship type after global deformation corresponding to the sample : Further controlling the interval according to the drainage volume Constructing a volume change constraint condition of the ship after global deformation; 。
7. The method for global deformation and optimization of a vessel in consideration of drain volume precise control and deformation rationality as set forth in claim 6, wherein the optimizing design space In, proxy model As an objective function, based on the volume change constraint condition of the ship after global deformation Performing optimization to obtain a group of optimization target parameters which meet the constraint condition of the volume change of the ship after global deformation and correspond to the optimal performance index And performing global deformation of the original ship form according to the set of optimizing target parameters.
8. A computer device comprising a memory, a processor and a computer program stored on the memory, characterized in that the processor executes the computer program to carry out the steps of the method according to any one of claims 1 to 7.
9. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method according to any one of claims 1 to 7.
10. A computer program product comprising computer instructions which, when executed by a processor, implement the steps of the method according to any one of claims 1 to 7.

Description

Ship global deformation and optimization method, program, equipment and storage medium considering drainage volume precise control and deformation rationality Technical Field The invention belongs to the technical field of intelligent digital optimal design of ships, and particularly relates to a ship global deformation and optimization method, program, equipment and storage medium considering accurate control of drainage volume and reasonability of deformation. Background The ship profile has an important influence on the hydrodynamic performance of the ship, wherein the effect of the hull drainage volume on the resistance performance is particularly remarkable. The prior art lacks an analytic means for directly predicting the volume change before deformation, so that the optimization process needs to rely on a large amount of trial and error, the calculation cost is high, and the result reliability is limited. For this reason, how to achieve efficient and accurate control of volume changes during optimization has been the focus of research in the art. The prior practice generally first determines a design space and selects a plurality of sample points, and then calculates the corresponding volume change of each sample point to verify whether the volume constraint is satisfied. If yes, continuing the subsequent optimization based on the sample points, and if not, reducing the design space and repeating the process. The method essentially belongs to gradual debugging and iterative debugging based on experience, and has lower efficiency. In addition, the final ship model is usually subjected to volume verification after the optimization is finished, and if the result still does not meet the constraint, the design space may need to be readjusted and optimized again, and the whole process has obvious experience and repeated iteration characteristics. Disclosure of Invention The invention aims to provide a global deformation and optimization method, program, equipment and storage medium for a ship, which take precise control of the volume of water discharge and reasonability of deformation into consideration, wherein the change of the volume of water discharge after deformation can be directly obtained through the value of a design variable without actual deformation, and the reasonability of a new ship can be judged. A ship global deformation and optimization method considering drainage volume precise control and deformation rationality comprises the following steps: Determining an original ship shape and a drainage volume control interval, and taking the initial position of a deformation area, the final position of the deformation area, the position of a fixed cross section in the deformation area and the amplitude of a global deformation modification function as optimization targets along the ship length direction of the original ship shape; Acquiring samples in the rule design space, wherein each sample is a group of optimizing target parameters, and an initial sample set is obtained; Constructing a deformation rationality constraint condition, and taking an intersection of a rule design space and the deformation rationality constraint condition as an optimizing design space; The method comprises the steps of performing screening on an initial sample set, removing samples which do not meet deformation rationality constraint conditions, obtaining real performance indexes of the ship after global deformation corresponding to each sample for the rest samples, constructing a proxy model, and outputting performance index estimation of the ship after global deformation corresponding to the sample according to the input samples by the proxy model; Setting a station number and a station abscissa, performing transverse section cutting on the original ship at each station abscissa along the ship length direction, calculating the area of each transverse section, and constructing a two-dimensional point set of the station abscissa and the area of the corresponding transverse section; performing Lagrange interpolation on the two-dimensional point set to obtain polynomial expression of an area curve of an original ship profile cross section, constructing a volume change amount expression of the ship profile after global deformation corresponding to the sample based on parameters in the polynomial, and further constructing a volume change amount constraint condition of the ship profile after global deformation according to a drainage volume control interval; In the optimizing design space, taking the agent model as an objective function, executing optimizing based on the volume change constraint condition of the ship after global deformation, acquiring a group of optimizing target parameters which meet the volume change constraint condition of the ship after global deformation and correspond to the optimal performance index, and executing global deformation of the original ship according to the group of optimizing target